Is it legal to terminate an employee for requesting a raise?

I was terminated for asking for a raise. I was employed for 14 months by the company. They increased my duties due to an employee from a different department quitting, so I was given duties outside of my hired job description with no indication that it was temporary. After doing the additional duties for over a month I requested an increase in salary to compensate for the additional responsibilities and stress associated with taking on the extra position. The president insulted me and became irate when I went to him with my request. He told me I need to resign and I had no right to ask for a raise. Because I didn't resign he hired someone to replace me and two weeks after my request he terminated me for requesting a raise. The details are all documented. Do I have legal rights against this reason for termination?